Answer:
m∠GDE
alternate interior angles
 
        
             
        
        
        
We basically have to cancel values on both sides until they are both on common ground.
7 + 3x = 5x + 13
-7 from both sides...
3x = 5x + 6
-5x from both sides...
-2x = 6
/-2 from both sides...
x = -3
Hope this helps!
        
             
        
        
        
Answer:
(f - g)(x) =  + 8x + 4
 + 8x + 4
Step-by-step explanation:
(f - g)(x)
= f(x) - g(x)
=  + 10x - (2x - 4) ← distribute parenthesis by - 1
 + 10x - (2x - 4) ← distribute parenthesis by - 1
=  + 10x - 2x + 4 ← collect like terms
 + 10x - 2x + 4 ← collect like terms
=  + 8x + 4
 + 8x + 4